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e16a7d8f3b
`et` means `expandtab`. ```sh rg 'vi: .* :vi' -l -0 | \ xargs -0 sed -i '' 's/vi: \(.*\) et\(.*\) :vi/vi: \1 xoet\2:vi/' rg 'vi: .* :vi' -l -0 | \ xargs -0 sed -i '' 's/vi: \(.*\)noet\(.*\):vi/vi: \1et\2 :vi/' rg 'vi: .* :vi' -l -0 | \ xargs -0 sed -i '' 's/vi: \(.*\)xoet\(.*\):vi/vi: \1noet\2:vi/' ```
93 lines
3.5 KiB
C
93 lines
3.5 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│ vi: set et ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi │
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2021 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/calls/calls.h"
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#include "libc/calls/sched-sysv.internal.h"
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#include "libc/calls/struct/cpuset.h"
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#include "libc/calls/syscall_support-nt.internal.h"
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#include "libc/dce.h"
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#include "libc/nt/accounting.h"
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#include "libc/runtime/runtime.h"
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#define CTL_HW 6
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#define HW_NCPU 3
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#define HW_NCPUONLINE_OPENBSD 25
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#define HW_NCPUONLINE_NETBSD 16
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#define ALL_PROCESSOR_GROUPS 0xffff
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static int __get_cpu_count_linux(void) {
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cpu_set_t cs = {0};
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if (sys_sched_getaffinity(0, sizeof(cs), &cs) != -1) {
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return CPU_COUNT(&cs);
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} else {
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return -1;
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}
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}
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static int __get_cpu_count_bsd(void) {
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size_t n;
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int c, cmd[2];
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n = sizeof(c);
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cmd[0] = CTL_HW;
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if (IsOpenbsd()) {
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cmd[1] = HW_NCPUONLINE_OPENBSD;
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} else if (IsNetbsd()) {
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cmd[1] = HW_NCPUONLINE_NETBSD;
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} else {
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cmd[1] = HW_NCPU;
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}
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if (!sys_sysctl(cmd, 2, &c, &n, 0, 0)) {
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return c;
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} else {
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return -1;
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}
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}
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static textwindows int __get_cpu_count_nt(void) {
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uint32_t res;
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if ((res = GetMaximumProcessorCount(ALL_PROCESSOR_GROUPS))) {
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return res;
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} else {
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return __winerr();
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}
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}
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/**
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* Returns number of CPUs in system.
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*
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* This is the same as the standard interface:
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*
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* sysconf(_SC_NPROCESSORS_ONLN);
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*
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* On Intel systems with HyperThreading this will return the number of
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* cores multiplied by two. On Linux, if you change cpu affinity it'll
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* change the cpu count, which also gets inherited by child processes.
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*
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* @return cpu count, or -1 w/ errno
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*/
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int __get_cpu_count(void) {
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if (!IsWindows()) {
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if (!IsBsd()) {
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return __get_cpu_count_linux();
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} else {
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return __get_cpu_count_bsd();
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}
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} else {
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return __get_cpu_count_nt();
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}
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}
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